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Usain Bolt beat Justin Gatlin by one hundredth of a second to retain the 100m title at the World Athletics Championships in Beijing. Bolt had stumbled out of the blocks in winning his semi-final but found a season's best run of 9.79 seconds to win the title for the third time. Gatlin, 33, had been unbeaten in 28 races and started as favourite after running 9.77secs in his semi-final. But Bolt, 29 had a much better start in the final and won his ninth world gold. After the race Bolt spoke to Sonja McLaughlan. This clip is originally from 5 live Sport on 23 August 2015.